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Definition of Dewey decimal classification noun from the Oxford Advanced Learner's Dictionary

 

Dewey decimal classification

 noun
noun
BrE BrE//ˌdjuːi ˈdesɪml klæsɪfɪkeɪʃn//
 
; NAmE NAmE//ˌdjuːi ˈdesɪml klæsɪfɪkeɪʃn//
 
, also NAmE//ˌduːi ˈdesɪml klæsɪfɪkeɪʃn//
 
(also Dewey system) [singular]
 
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an international system for arranging books in a library Culture The Dewey system was invented by Melvil Dewey (1851-1931), a US librarian. Dewey gave every subject a number between 0 and 999. Every book in a library is given one of these numbers so that books on a particular subject are easy to find. New subjects have been added to Dewey's original list by using decimal numbers, e.g. 331.1, 331.2, etc. Word Origin late 19th cent.: named after Melvil Dewey (1851–1931), American librarian.
See the Oxford Advanced American Dictionary entry: Dewey decimal classification